California’s beaches may be some of the most photographed and well-documented coastlines in the world, but just miles from the shore, scientists are still finding creatures never seen by humans.

They are iridescent, bright blue and jellylike, with stinging tentacles that dangle from their flat, oval-shaped bodies. Just 3 to 4 inches long, these alien-looking creatures use a short, clear flap ...

'Velella velella are deep blue or purple in colour and often cause confusion if they wash in, in vast numbers, creating a ...